nixpkgs/nixos/modules/tasks/cpu-freq.nix

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{ config, lib, pkgs, ... }:
with lib;
let
cpupower = config.boot.kernelPackages.cpupower;
cfg = config.powerManagement;
in
{
###### interface
options = {
powerManagement.cpuFreqGovernor = mkOption {
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type = types.nullOr types.str;
default = null;
example = "ondemand";
description = ''
Configure the governor used to regulate the frequence of the
available CPUs. By default, the kernel configures the
performance governor.
'';
};
};
###### implementation
config = mkIf (!config.boot.isContainer && config.powerManagement.cpuFreqGovernor != null) {
boot.kernelModules = [ "cpufreq_${cfg.cpuFreqGovernor}" ];
environment.systemPackages = [ cpupower ];
systemd.services.cpufreq = {
description = "CPU Frequency Governor Setup";
after = [ "systemd-modules-load.service" ];
wantedBy = [ "multi-user.target" ];
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path = [ cpupower pkgs.kmod ];
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unitConfig.ConditionVirtualization = false;
serviceConfig = {
Type = "oneshot";
RemainAfterExit = "yes";
ExecStart = "${cpupower}/bin/cpupower frequency-set -g ${cfg.cpuFreqGovernor}";
SuccessExitStatus = "0 237";
};
};
};
}